package org.ThreadDemo.collections;

import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;

public class ThreadDemo06 {

    /**
     *
     * List 线程不安全
     */
    public static void main(String[] args) {
       // List<String> list = new Vector<>();
        //List<String> list  = Collections.synchronizedList(new ArrayList<>());
        List<String> list = new CopyOnWriteArrayList<>() ;

        for(int i = 0;i<20 ;i++){
            new Thread(
                    ()->{
                        list.add(UUID.randomUUID().toString().substring(0,8));
                        System.out.println(list);
                    },String.valueOf(i)
            ).start();
        }
    }
}
